Bluebird Predator Guard

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This Predator Guard Keeps Predators Out of Your Bluebird Nest Box by Going Outside the Nest Box, Reducing the Risk of Predation. You Can Modify Any Parameters in This Openscad File to Suit Your Needs, Including Depth, Width, and Height of the Tunnel. The Parameters Are Set for an Elliptical Opening, Which Is Generally Agreed to Be Optimal for Eastern Bluebirds, But You're Free to Change It for Other Species or Local Conditions. Printed with Zero Extra Shells and 100% Fill for Maximum Strength, This Guard Is a Must-Have for Any Serious Birder. For Best Results, Use PLA Instead of ABS.